CASE-STUDIES OF TROPOSPHERIC OZONE EVENTS OBSERVED AT THE SUMMIT OF MOUNT FUJI

Citation
Y. Tsutsumi et al., CASE-STUDIES OF TROPOSPHERIC OZONE EVENTS OBSERVED AT THE SUMMIT OF MOUNT FUJI, J GEO RES-A, 103(D14), 1998, pp. 16935-16951
Citations number
41
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Metereology & Atmospheric Sciences","Geosciences, Interdisciplinary","Astronomy & Astrophysics",Oceanografhy,"Geochemitry & Geophysics
Volume
103
Issue
D14
Year of publication
1998
Pages
16935 - 16951
Database
ISI
SICI code
Abstract
Tropospheric ozone events observed at the summit of Mount Fuji (3776 m above sea level) were analyzed as case studies. The ozone, intruding from the lower stratosphere by the cutoff low or the tropopause fold o ver the Asian continent, is transported to the middle troposphere over Japan even in summer. The subtropical jet, which is intensified over Japan, also contributes to the summer intrusion from the stratosphere. A long stratospheric streamer, as described previously by Appenzeller et al. [1996], brings about a persistent ozone enhancement at the sum mit of Mount Fuji. The large variation of summer ozone over Japan is a ttributable to the alternate overspreading of these ozone-rich stratos pheic air masses and the ozone-depleted subtropical maritime air mass. In contrast, winter ozone variation is relatively small at the summit of Mount Fuji. The steep potential temperature gradient between 500 h Pa and 300 hPa in the winter cutoff low, which restrains vertical mixi ng in the upper troposphere, possibly causes less influence of the str atospheric air mass on the middle troposphere in winter, since mixing processes around a cutoff low play an important role in air mass excha nge between the stratosphere and the troposphere.